(387d) A Comparative Study of Chemical and Physical Treatment of Greywater

Water recycling is important for the purpose of water conservation in the state of California. Greywater is defined as water effluent that originates from kitchen, laundry rooms, bathrooms/washrooms, sinks, and showers and is composed of mostly chemicals and biological organisms. The treatment of greywater allows for the greywater to be recycled and reused for non-potable uses such as irrigation and washing in a house or residential complexes. Both physical and chemical methods can be used to treat greywater. In this study, the photocatalytic treatment of greywater by titanium dioxide nanoparticles under UV light is investigated and compared with single batch distillation and filtration. The parameters such as dissolved oxygen content, chemical oxygen demand, pH, and turbidity have been studied. The results show that filtration and distillation techniques are not viable because of their high energy requirements. The titanium dioxide nanocatalyst under UV light shows a good activity and stability for greywater treatment.